Dear Colleagues,

Fluids are ubiquitous in nature: from the atmosphere where we live and breathe, to the oceans, the seas, the lakes, and the rivers that provide food and allow for transportation and commerce, to the natural reservoirs that store water for potable and agricultural uses or petroleum and methane gas allocated for industry. Moreover, fluids are the main component of the human body, to which they provide nutrients and oxygen. The fundamental role of fluids in life has always been reflected in the interest of science in them—starting back in the 3rd century B.C., with Archimedes and static buoyancy, via Bernoulli and his energy conservation theorem, Newton and the basic correlation between fluids internal friction and kinematic characteristics of flow, D’Alembert and the principle of continuity, Navier and the equation of momentum for viscous fluids, Reynolds and Prandtl and their crucial contribution to the study of turbulence, De Saint-Venant and his benchmark one-dimensional theory for streams, up to the most recent numerical and/or stochastic fluid–mechanical declinations.

The present Special Issue aims at collecting a series of analytical, numerical, and experimental studies (research or review articles) proving the universal predictive ability of the cardinal equations of fluid mechanics—both in the classic point-like or in the finite-volume up-scaled version—in terms of some of the most serious contemporary hazards and mitigation challenges. In such a context, by properly highlighting the peculiarities of each single approach, the progresses achieved in research fields might only, apparently, be made available away from each other to the wider scientific community. Thus, papers focusing on the fluid–mechanical interpretation of the hydro-geo-morphological instability of drainage basins, climate changes and criticalities, contamination of surface and subsurface water bodies, air/water diffusion of viruses and bacteria, circulation of biological fluids, and deterioration of natural fluid habitats for animal species are kindly encouraged.

Dr. Marilena Pannone
Dr. Annamaria De Vincenzo
Guest Editors

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• cardinal fluid-mechanical equations
• deterministic or stochastic frameworks
• hydrology
• hydrodynamics
• hydrogeology climate
• geomorphology
• natural instabilities and vulnerabilities
• natural fluid body contamination
• bio-fluids
• biological hazards